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For Teens: Understanding Chlamydia

Man holding box of condoms.
Use latex condoms to help prevent the spread of STDs like chlamydia.

Chlamydia is an STI (sexually transmitted infection) that spreads when body fluids are passed during sex. An STI is also called a sexually transmitted disease (STD). Signs of chlamydia are often absent or hard to notice. So get checked if you think you might have it or could have been exposed to it. Chlamydia can be cured. But if it’s not treated soon enough, it can cause sterility. This can prevent you from being able to have children. It can also cause other long-lasting health problems.

What to look for

Often, chlamydia causes no symptoms. Chlamydia symptoms, when they occur, may appear within a few days or weeks after you catch it. The symptoms can also change over time. Early on, common signs include:

  • Discharge from the penis, vagina, or rectum

  • Pain or burning during urination

  • Pain or bleeding from the rectum

  • Abnormal vaginal bleeding


Chlamydia can be treated and cured with antibiotics. A single dose is often all that’s needed. But sometimes an antibiotic needs to be taken twice each day for 1 to 3 weeks. Your partner(s) also needs to be treated. Otherwise your partner can pass the disease back to you. And don’t have sex until you’re told it’s OK.

If you don’t get treated

Chlamydia can spread and cause damage that keeps you from being able to have kids. Or it can cause long-lasting pain or scarring of the genitals or rectum. Here are some warning signs of that damage:

  • Men can have continued discharge, pain, and swelling in the testicles or rectum. They may also have a fever.

  • Women can have chronic pelvic pain or abnormal vaginal bleeding. These are 2 of the possible signs of pelvic inflammatory disease (PID).

What is PID?

Pelvic inflammatory disease (PID) is an infection in women. It can cause mild or severe symptoms. These include pain in the lower belly, fever, vaginal discharge, and pain during sex. Over time, PID can damage the reproductive organs. It can make it hard or impossible to have children naturally.

Online Medical Reviewer: Barry Zingman MD
Online Medical Reviewer: Donna Freeborn PhD CNM FNP
Online Medical Reviewer: L Renee Watson MSN RN
Date Last Reviewed: 4/1/2020
© 2000-2021 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.